SDCC2011: Clip Released from "Adventure Time with Fionna and Cake"

Cartoon Network has released the following clip from Adventure Time with Fionna and Cake that was screened for fans at this year’s San Diego Comic-Con panel:

The episode guest-stars Neil Patrick Harris as Prince Gumball. Simpsons and Futurama creator Matt Groening also made a surprise appearance at the panel to declare, “Other than my own stuff, Adventure Time is my favorite show.” Cartoon Network has released the following photo from Groening’s appearance (click to enlarge):

Adventure Time airs on Monday nights at 8:00 PM (ET/PT) on Cartoon Network.